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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/15992
Tipo: Artigo de Periódico
Título: Chemostratigraphic correlation of Neoproterozoic successions in South America
Título(s) alternativo(s): Chemical Geology
Autor(es): Misi, Aroldo
Kaufman, Alan J.
Veizer, Jàn
Powis, Kelli
Azmy, Karem
Boggiani, Paulo Cesar
Gaucher, Claudio
Teixeira, João Batista Guimarães
Sanches, Andreia L.
Iyer, Sundaram Sankara Subba
Autor(es): Misi, Aroldo
Kaufman, Alan J.
Veizer, Jàn
Powis, Kelli
Azmy, Karem
Boggiani, Paulo Cesar
Gaucher, Claudio
Teixeira, João Batista Guimarães
Sanches, Andreia L.
Iyer, Sundaram Sankara Subba
Abstract: The Neoproterozoic successions of South America largely accumulated during extensional events associated with the breakup of Rodinia. These units are preserved as thick carbonate and siliciclastic strata in epicontinental seaways and shallow marine environments on passive cratonal margins, which have been intensely deformed in mobile belts surrounding the craton. Volcaniclastic and siliciclastic materials are associated with some of the marginal fold belts. Three mega-sequences are represented in the cratonal area: glaciogenic, carbonate and molasse. At least two transgressive-regressive sea level cycles occurred during the evolution of the carbonate mega-sequence, which lies above iron-cemented glacio-marine diamictite of probable Sturtian age. We report high resolution carbon, oxygen, strontium and sulfur isotope trends from analyses of well-preserved sample sets and use principally strontium and carbon isotopes from the best preserved samples in concert with lithostratigraphic and biostratigraphic observations to provide detailed correlations of the South American Neoproterozoic successions. Lead–zinc deposits, some of which with important metal reserves seem to be restricted to the Sturtian carbonate succession and associated with a sequence boundary at the end of the first transgressive–regressive cycle. Phosphate deposits are found in both Sturtian and Varangerian/Marinoan carbonate successions, above glaciogenic sequences.
Palavras-chave: Chemostratigraphy
Neoproterozoic
Correlation
South America
Citação: http://dx.doi.org/10.1016/j.chemgeo.2006.06.019
Tipo de Acesso: Acesso Aberto
URI: http://repositorio.ufba.br/ri/handle/ri/15992
Data do documento: 2007
Aparece nas coleções:Artigo Publicado em Periódico (IGEO)

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